vid_vesa.c

The source code of Doom legacy for windows

// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: Vid_vesa.c,v 1.5 2001/03/03 06:17:34 bpereira Exp $
//
// Copyright (C) 1998-2000 by DooM Legacy Team.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
//
// $Log: Vid_vesa.c,v $
// Revision 1.5  2001/03/03 06:17:34  bpereira
// no message
//
// Revision 1.4  2001/01/25 22:15:45  bpereira
// added heretic support
//
// Revision 1.3  2000/08/31 14:30:57  bpereira
// no message
//
// Revision 1.2  2000/02/27 00:42:11  hurdler
// fix CR+LF problem
//
// Revision 1.1.1.1  2000/02/22 20:32:33  hurdler
// Initial import into CVS (v1.29 pr3)
//
//
// DESCRIPTION:
//      extended vesa VESA2.0 video modes i/o.
//
//-----------------------------------------------------------------------------


#include <stdlib.h>

#include "../i_system.h"        //I_Error()
#include "vid_vesa.h"
#include "../doomdef.h"         //MAXVIDWIDTH, MAXVIDHEIGHT
#include "../screen.h"

#include <dpmi.h>
#include <go32.h>
#include <sys/farptr.h>
#include <sys/movedata.h>
#include <sys/segments.h>
#include <sys/nearptr.h>

#include "../console.h"
#include "../command.h"            //added:21-03-98: vid_xxx commands
#include "../i_video.h"


// PROTOS
vmode_t *VID_GetModePtr (int modenum);
int  VID_VesaGetModeInfo (int modenum);
void VID_VesaGetExtraModes (void);
int  VID_VesaInitMode (viddef_t *lvid, vmode_t *pcurrentmode);

void VID_Command_NumModes_f (void);
void VID_Command_ModeInfo_f (void);
void VID_Command_ModeList_f (void);
void VID_Command_Mode_f (void);

consvar_t   cv_vidwait = {"vid_wait","1",CV_SAVE,CV_OnOff};

#define VBEVERSION      2       // we need vesa2 or higher

// -----------------------------------------------------
#define MASK_LINEAR(addr)     (addr & 0x000FFFFF)
#define RM_TO_LINEAR(addr)    (((addr & 0xFFFF0000) >> 12) + (addr & 0xFFFF))
#define RM_OFFSET(addr)       (addr & 0xF)
#define RM_SEGMENT(addr)      ((addr >> 4) & 0xFFFF)
// -----------------------------------------------------

static int totalvidmem;

static vmode_t      vesa_modes[MAX_VESA_MODES] = {{NULL, NULL}};
static vesa_extra_t vesa_extra[MAX_VESA_MODES];

//this is the only supported non-vesa mode : standard 320x200x256c.
#define NUMVGAVIDMODES  1
int VGA_InitMode (viddef_t *lvid, vmode_t *pcurrentmode);
static vmode_t      vgavidmodes[NUMVGAVIDMODES] = {
  {
    NULL,
    "320x200",
    320, 200,  //(200.0/320.0)*(320.0/240.0),
    320, 1,    // rowbytes, bytes per pixel
    0, 1,
    NULL,
    VGA_InitMode
  }
};

static char         names[MAX_VESA_MODES][10];

//----------------------------i_video.c------------------------------------
// these ones should go to i_video.c, but I prefer keep them away from the
// doom sources until the vesa stuff is ok.
   int     numvidmodes;   //total number of video modes, vga, vesa1, vesa2.
   vmode_t *pvidmodes;    //start of videomodes list.
   vmode_t *pcurrentmode; // the current active videomode.
//----------------------------i_video.c------------------------------------



// table des modes videos.
// seul le mode 320x200x256c standard VGA est support